Oracle Message ORA-19727 - cannot plug data [string] at level string into database running Oracle string

ERRORcannot plug data [string] at level string into database running Oracle string
CAUSESome of the data in the pluggable set requires a compatibility level higher than the release level of the Oracle executable. The string in square bracket is the name of the compatibility type associated with the data.
ACTIONUpgrade Oracle and retry the operation.